There are more than 5,000 known species of mammals alive today. There are three major groups: monotremes (egg-laying mammals), marsupials (pouched mammals) and placentals (mammals whose babies develop inside the mother's womb, fed by a placenta). By far the largest group is the placentals - that's where human beings fit in.
There are more than 5,000 known species of mammals alive today. There are three major groups: monotremes (egg-laying mammals), marsupials (pouched mammals) and placentals (mammals whose babies develop inside the mother's womb, fed by a placenta). By far the largest group is the placentals - that's where human beings fit in.
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